Multiple Choice Questions

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Repressor protein is produced by

  • regulator gene

  • operator gene

  • structural gene

  • promoter gene


A.

regulator gene

The regulator gene is responsible for the synthesis of a protein called repressor. It may be active or inactive (aporepressor). The active repressor is normally seen in inducible systems while aporepressor is seen in repressible system. The repressor has an affinity for operator gene.


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The back bone of RNA consists of which of the following sugar?

  • Deoxyribose

  • Ribose

  • Sucrose

  • Maltose


Stop codons are

  • AUG, GUG

  • UAA, UGA, UAG

  • UAC, UGG

  • AGU, AGA, UAC


A eukaryotic gene contains two kinds of base sequences. Which of these plays an important role in protein synthesis?

  • Introns

  • Exons

  • Both (a) and (b)

  • None of these


DNA mutiplication is called

  • translation

  • replication

  • transduction

  • transcription


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Jumping genes in maize were discovered by

  • Hugo de Vries

  • Barbara McClintock

  • T H Morgan

  • Mendel


DNA element with ability to change position is called

  • cistron

  • transposon

  • intron

  • recon


Initiation codon is

  • UUU

  • UGA

  • AUG

  • UAG


Balbiani rings are the structural features of

  • allosomes

  • polytene chromosomes

  • autosomes

  • lampbrush chromosomes


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Which of the following is not a Pyrimidine?

  • Thymine

  • Uracil

  • Guanine

  • Cytosine


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